Higher alkano yl-propanediol-(1,3)-2 -trimethylammonium-ethyl phosphates

ABSTRACT

WHEREIN N IS AN INTEGER FROM 16 TO 25, INCLUSIVE; THE COMPOUNDS ARE USEFUL AS IMMUNOLOGIC ADJUVANTS.   Compounds of the formula

United States Patent Eiblet al.

[54] HIGHER ALKANO YL-PROPANEDIOL- (l,3)-2 -TRIMETHYLAMMONIUM- ETHYL PHOSPHATES [72] Inventors: llansjorg E. Eibl, Gabelsberger- 'Strasse 4; Otto Westphal, In der Rothe 14, both of Freiburg,

Breisgau, Germany 22 Filed: July 2,1911

21 Appl. No.: 159,524

[30] Foreign Application Priority Data [451 Sept. 26, 1972 OTHER PUBLICATIONS Chemical Abstracts Vol. 73 (1970) P01, 109, 239t.

Primary Examiner-Elbert L. Roberts Attorney-Hammond E. Littell [57] ABSTRACT Compounds of the formula 0 CH2 On 2n+l wherein n is an integer from 16 to 25, inclusive; the compounds are useful as immunologic adjuvants.

5 Claims, No Drawings HIGHER ALKANO YL-PRoPANEmoL-u ,3 -2 TRIMETHYLAMMONIUM-ETHYL PIIOSPHATES This invention relates to novel higher alkanoylpropanediol-( l ,3 )-2'-trimethylammonium-ethyl phosphates, as well as to a method of preparing these compounds.

More particularly, the present invention relates to a novel class of higher alkanoyl-propanediol-(1,3 )-2'- trimethylammonium-ethyl phosphates of the formula CHr-O- -CnH-2i +1 H2 m-o-P 05-6 HzCHzi I (CH )3 wherein n is an integer from 16 to 25, inclusive.

A compound of the formula I is prepared by reacting 1,3-propanediol with a higher alkanoyl halide of the formula 0 v Ha1-l -c..m.n l 7 (11) wherein n has the same meanings as in Formula I and Hal is halogen, to form a monoester of the formula cur-0H 111) wherein n has the meanings defined above, reacting said monoester with phosphoric acid mono-(B- bromoethyl)-ester dichloride to form a higher alkanoyl-propanediol-( 1 ,3 )-phosphoric acid [3- bromoethyl ester of the formula 0 cnr-o- -onmm H (EHr-O-P Ogr-GHz-C HPBX' H (IV) invention and will enable others skilled in the art to understand it more completely. It should be understood, however, that the invention is not limited solely to the particular examples given below.

, EXAMPLE 1 Stearoyl-propanediol-( 1 ,3 )2 -trimethylammoniumethyl phosphate monohydrate a. 1,3-Propanediol monostearate A solution of 18 millimols of stearoyl chloride in 20 ml of absolute chloroform was added dropwise to a mixture consisting of 66 millimols of 1,3-propanediol, 5 ml of pyridine and 5 ml of chloroform at 0C. (ice bath), accompanied by stirring, and the reaction mixture was stirred for 30 minutes more on the ice bath. Thereafter,the ice bath was removed and stirring was continued for 12 hours at room temperature. Subsequently, the reaction solution was concentrated by evaporation in vacuo on a water bath at 40 to 50C.,

and the oily residue was poured into 800 ml of 0.2 N sulfuric acid on an ice bath. The white precipitate formed thereby was collected by vacuum filtration, washed thoroughly with water, dried in vacuo over blue silicagel, and recrystallized from petroleum ether (40 to 60C.). The raw product thus obtained was purified by chromatography or silicagel and recrystallization from petroleum ether, yielding pure 1,3-propanediol monostearate.

b. Stearoy1-propanediol-( 1,3)-phosphoric monocholine ester Forty-five millimols of anhydrous triethylamine and 18.5 millimols of B-bromoethyl-phosphoric acid dichloride were added to 15 ml of absolute chloroform at 0C. (ice bath) and, while stirring the mixture on the ice bath, a solution of 6.5 millimols of 1,3-propanediol monostearate in 15 ml of absolute chloroform was added dropwise thereto. The resulting reaction mixture was then allowed to stand at room temperature for 6 hours and at 40C. for 12 hours. Subsequently, the dark-colored solution was cooled to 0C., and then 15 ml of 0.1 N potassium chloride were added to hydrolyze the phosphoric acid chlorides. Thereafter, the reaction mixture was stirred for one hour, 25 ml of methanol were added, the pH was adjusted to about 3 with concentrated hydrochloric acid, and the acidic mixture was thoroughly shaken. The organic phase was evaporated, and the residue was dried over phosphorus pentoxide in a high vacuum.

A mixture consisting of the phosphorylation product thus obtained, 50 ml of butanol and 10 ml of trimethylamine was heated for 12 hours at 55C., the mixture was then cooled to 0C., and the crystalline precipitate formed thereby was collected by vacuum filtration and washed with acetone, with'water and again with acetone. For further purification, the product was stirred for 30 minutes with a solution of 1 gm of silver acetate in aqueous percent methanol, then chromatographed on silicagel and finally recrystallized from butanone, yielding 50 percent of theory (based on 1,3-propanediol monostearate) of the internal salt of the formula acid 5.90% Found: C58.2%; I-Il0.63%; N--2.49%; P-5.93%

EXAMPLE 2 Using a procedure analogous to that described in Example 1 arachidoyl-propanediol-( 1,3)-2'-trimethylammoniumethyl phosphate monohydrate of the formula was prepared from 1,3-propanediol monoarachidate, B-bromoethyl-phosphoric acid dichloride and trimethylamine. The product has an R value of 0. l 5 Analysis: C H NO, P; mol. wt. 553.8

Calculated: C--60.8%; H-l0.92%; N2.53%; P-

5.60% Found: C-59.3%; l-l-l 1.05%; N2.40%; P5.58% 7 EXAMPLE 3 Using a procedure analogous to that described in Example l behenoyl-propanediol-( l ,3 )-2'-trimethylammoniumethyl phosphate monohydrate of the formula EXAMPLE 4 Using a procedure analogous to that described in Example l, cerotoyl-propanediol-( l ,3)-2-trimethylammoniumethyl phosphate monohydrate of the formula CH 0 E was prepared from l,3-propanediol monocerotate, B- bromo-ethyl-phosphoric acid dichloride and trimethylamine. The product has an R value of 0.25 Analysis: C H NO P; mol. wt. 637.8 Calculated: C64.0%; H1 1.38%; N2.20%; P- 4.86% Found: C62.6%; H-l 1.49%; N2.4l%; P4.69%

The compounds of the present invention have useful pharmacological properties. More particularly, they exhibit interfacial activities and, upon peroral or parenteral administration, lead to an alteration of the interfacial activity of cell membranes in the animal organism. While higher concentrations produce cytolytic phenomena, such as hemolysis, a dosage-dependent alteration of the membrane interfacial activity is observed at sublytic dosage levels. Thus, the compounds of the instant invention are useful as immunologic adjuvants in warm-blooded animals, such as mice.

In immunology, adjuvants are understood to be substances which, when mixed with an antigen, enhance antigenicity and increase the immune response of the organism to an antigenic stimulus, i.e., the formation of antibodies. With the aid of adjuvants it is, for instance, possible to counteract the so-called immunoparalysis, that is, to initiate the formation of antibodies even with those antigens which are otherwise tolerated by the organism.

The immunologic adjuvant activity of the compounds of the present invention was ascertained as follows:

l. The test was carried out in analogy to the method of Dresser [Immunology 9 (1965) 261]. The basic principle of this test procedure consists in the inducement of tolerance by means of a soluble protein. This test procedure determines the ability of substances to increase the immune response in the organism against the extremely weak immunogenic bovine gammaglobulin (BGG) to the degree that antibodies for this protein may be clearly proven. For this purpose, mice are administered a 5 mgm dose of centrifuged, aggregate-free BGG by intraperitoneal injection. Normally, with this dose no antibodies are detectable after 8 to 10 days, which means that the animals are not immunized, and under these conditions they are incapable of an immune response to BGG. However, administration of B66 in combination with an immunologic adjuvant prevents the temporary development of tolerance, and the animals then form antibodies against 800 which they normally tolerate. Some 10 to 12 days following initial administration of the tolerific protein, 866 labeled with iodine-125 is again injected. If the animals are tolerant, the labeled antigen is slowly broken down similar to endogenous gammaglobulin. On the other hand, if the animals are immune, a so-called immune elimination takes place, i.e., the labeled antigen is removed from the circulation at a much more rapid rate. Thus, the speed of elimination of iodine-125- labeled BGG is a measured of antibodies formation.

In tests with the compounds of the instant invention it was found that animals treated with labeled BGG and a compound of the Formula 1 eliminated the tracer protein from the circulation about 10 to times faster than saline-treated controls.

2. Another immunologic test method for antibodies by which immunologic adjuvant properties can be determined is based on the principle that the immunogen (B66) is coupled with erythrocytes, and the thus treated cells are incubated for 20 hours at 4C.

with serum in a geometric series of dilution. If the serum contains antibodies, the erythrocyte agglutinates. The highest concentration at which this phenomenon can still be observed is known as the antibody-titer of the serum.

This considerably less accurate method, however, also clearly proved that the compounds of this invention are highly active immunologic adjuvants.

For pharmaceutical purposes the compounds of the Formula I are administered to warm-blooded animalsperorally or parenterally, but preferably by intraperitoneal injection, as active ingredients in customary dosage unit compositions, that is, compositions in dosage unit form consisting essentially of an inert pharmaceutical carrier and one effective dosage unit of the active ingredient, such as tablets, coated pills, capsules, wafers, powders, solutions, suspensions, emulsions, syrups, suppositories and the like. One effective immunologic adjuvant dosage unit of the compound of the instant invention is from 0.01 to 5 mgm/kg body weight, depending upon the degree of potentiation of immune response desired.

The following examples illustrate a few dosage unit compositions comprising the compound of the Formula I as an active ingredient and represent the best modes contemplated of putting the invention into practical use. The parts are parts by weight unless otherwise specified.

. EXAMPLE 5 Coated Pillsv The pill core composition is compounded from the following ingredients:

Stearoyl-propanediol-( l ,3

phosphoric acid monocholine Preparation 2 The monocholine phosphate is intimately admixed with the calcium phosphate and the corn starch, the resulting mixture is moistened with an ethanolic percent solution of the polyvinylpyrrolidone, the moist mass is forced through a 1.5 mm-mesh screen, the resulting granulate is dried at 45C. and again through the screen, the dry granulate is uniformly admixed with the carboxymethyl cellulose and the magnesium stearate, and the finished composition is compressed into 240 mgm-pill cores which are subsequently coated with a thin shell consisting essentially of a mixture of talcum and sugar and polished with beeswax. Each coated pill contains 100 mgm of the monocholine phosphate and is an oral dosage unit composition with effective immunologic adjuvant action.

EXAMPLE 6 Tablets The tablet composition is compounded from the following ingredients:

Arachidoyl-propanediol-(1,3)-

phosphoric acid monocholine The monocholine phosphate is intimately admixed with the lactose, the corn starch and the polyvinylpyrrolidone, the mixture is moistened with water; the moist mass is forced through a 1.5 mm-mesh screen, dried at 45C. and again passed through the screen; the resulting dry granulate is uniformly admixed with the cellulose and the magnesium stearate, and the finished composition is compressed into 450 mgm-tablets. Each tablet contains 200 mgm of the monocholine.

phosphate and is an oral dosage unit composition with effective immunologic adjuvant action.

EXAMPLE 7 Drop Solution The solution is compounded from the following ingredients:

Behenoyl-propanediol-( l ,3 phosphoric acid monocholine The propyleneglycol is admixed with 45 parts of distilled water, and the monocholine phosphate is dis- 0 solved in the mixture (solution A). The o-hydrox- EXAMPLE 8 l-iypodermic Solution The solution is compounded from the following ingredients:

Cerotoyl-propanediol-( 1,3

phosphoric acid-monocholine ester monohydrate 50.0 parts Polypropyleneglycol 2500.0 Tartaric acid 15.0 Distilled water q.s.ad 5000.0 by vol.

Preparation Two thousand parts of distilled water are heated to about 50C., and then the indicated amount of polypropyleneglycol is added thereto; thereafter, the monocholine phosphate and the tartaric acid are dissolved therein, and the resulting solution is diluted with additional distilled water to the indicated volume. The finished solution is filtered until free from suspended particles, and the filtrate is filled into 5 ml-ampules which are then sealed and sterilized. Each ampule contains 50 mgm of the monocholine phosphate, and the contents thereof are an intraperitoneally injectable dosage unit composition with effective immunologic adjuvant action.

Analogous results were obtained when any one of the other compounds embraced by formula 1 was substituted for the particular monocholine ester in Examples 5 through 8. Likewise, the amount of active ingredient in these illustrative examples may be varied to achieve the dosage unit range set forth above, and the amounts and nature of the inert pharmaceutical carrier ingredients may be varied to meet particular requirements.

LII

wherein n is an integer froml6 to 25, inclusive.

2. A compound according to claim 1, which is stearoyl-propanediol-( 1,3 )-2'-trimethylammoniumethyl phosphate.

3. A compound according to claim 1, which is arachidoyl-propanediol,l ,3)-2 trimethylammoniumethyl phosphate.

4. A compound according to claim 1, which is behenoyl-propanediol-( l ,3 )-2-trimethylammoniumethyl phosphate.

5. A compound according to claim 1, which is cerotoyl-propanediol-( 1,3 )-2'-trimethylammoniumethyl phosphate.

N0 3,69 m73 new; September 1972,

- Invent fls) HANsJoRG Ea EIBL and OTTO WESTPHAL It is certified that error appears in the above-identified patent I end that said Letters Patent axe hereby corrected as shown below:

Insert 73] Assignee: Boehringer Ingelheim GmbH' A Ingelheim/Rhein, Germany 001-, 5, line '26 insert -passed-- after "again C01. 6, line 20 correct "o-hydroX- to read -p-hydrox Signed end" sealed this 29th day of May 1973..

(SEAL) Attesc: B

EDWARD M..FLETC- HER,JR. I ROBERT GOTTSCHALK Attest ing Officer Commissioner of Patents 

2. A compound according to claim 1, which is stearoyl-propanediol-(1,3)-2''-trimethylammonium-ethyl phosphate.
 3. A compound according to claim 1, which is arachidoyl-propanediol-(1,3)-2''-trimethylammonium-ethyl phosphate.
 4. A compound according to claim 1, which is behenoyl-propanediol-(1,3)-2''-trimethylammonium-ethyl phosphate.
 5. A compound according to claim 1, which is cerotoyl-propanediol-(1,3)-2''-trimethylammonium-ethyl phosphate. 